diff --git a/src/app/dialogs/tools/dialogeditwrongformula.ui b/src/app/dialogs/tools/dialogeditwrongformula.ui
index 1c240dfa3..c24142095 100644
--- a/src/app/dialogs/tools/dialogeditwrongformula.ui
+++ b/src/app/dialogs/tools/dialogeditwrongformula.ui
@@ -14,7 +14,7 @@
    </rect>
   </property>
   <property name="windowTitle">
-   <string>Edit wrong formula</string>
+   <string>Edit formula</string>
   </property>
   <property name="windowIcon">
    <iconset resource="../../share/resources/icon.qrc">
diff --git a/src/app/dialogs/tools/dialogtool.cpp b/src/app/dialogs/tools/dialogtool.cpp
index 515ab0109..444fec323 100644
--- a/src/app/dialogs/tools/dialogtool.cpp
+++ b/src/app/dialogs/tools/dialogtool.cpp
@@ -377,11 +377,13 @@ void DialogTool::ValFormulaChanged(bool &flag, QLineEdit *edit, QTimer *timer)
     SCASSERT(edit != nullptr);
     SCASSERT(timer != nullptr);
     SCASSERT(labelEditFormula != nullptr);
+    SCASSERT(labelResultCalculation != nullptr);
     if (edit->text().isEmpty())
     {
         flag = false;
         CheckState();
         ChangeColor(labelEditFormula, Qt::red);
+        labelResultCalculation->setText(tr("Error"));
         return;
     }
     timer->start(1000);
@@ -392,11 +394,13 @@ void DialogTool::ValFormulaChanged(bool &flag, QPlainTextEdit *edit, QTimer *tim
     SCASSERT(edit != nullptr);
     SCASSERT(timer != nullptr);
     SCASSERT(labelEditFormula != nullptr);
+    SCASSERT(labelResultCalculation != nullptr);
     if (edit->toPlainText().isEmpty())
     {
         flag = false;
         CheckState();
         ChangeColor(labelEditFormula, Qt::red);
+        labelResultCalculation->setText(tr("Error"));
         return;
     }
     timer->setSingleShot(true);
@@ -423,6 +427,7 @@ void DialogTool::Eval(const QString &text, bool &flag, QTimer *timer, QLabel *la
     {
         flag = false;
         ChangeColor(labelEditFormula, Qt::red);
+        label->setText(tr("Error"));
     }
     else
     {
@@ -441,6 +446,7 @@ void DialogTool::Eval(const QString &text, bool &flag, QTimer *timer, QLabel *la
             {
                 flag = false;
                 ChangeColor(labelEditFormula, Qt::red);
+                label->setText(tr("Error"));
             }
             else
             {
diff --git a/src/app/tools/drawTools/vdrawtool.cpp b/src/app/tools/drawTools/vdrawtool.cpp
index 2eda94d91..106025ada 100644
--- a/src/app/tools/drawTools/vdrawtool.cpp
+++ b/src/app/tools/drawTools/vdrawtool.cpp
@@ -209,6 +209,7 @@ qreal VDrawTool::CheckFormula(const quint32 &toolId, QString &formula, VContaine
             if (resultUndo == UndoButton::Fix)
             {
                 DialogEditWrongFormula *dialog = new DialogEditWrongFormula(data, toolId, qApp->getMainWindow());
+                dialog->setWindowTitle(tr("Edit wrong formula"));
                 dialog->setFormula(formula);
                 if (dialog->exec() == QDialog::Accepted)
                 {